Funny, with an eBay name like "Corse Desmo" you'd hope they knew something...

[NAKID]

The seller messaged me (I thought I'd be nice and let him know that those were not 900 jugs) and the response was :

Thanks for the catch, they are 748 jugs with only 200 miles. 

Uhhhh, those are still 2 valve pistons, no?

[TAftonomos]

Pretty sure the Radical pictured above is using a ST based motor (2 or 3).  Don't know why you'ld use a water cooled 2V ?  Do build built 900 motors run hot on the track?

Ducati ERV is a good dude, and has some sick sick stuff (MV Ago and others)

[junior varsity]

Uhhhh, those are still 2 valve pistons, no?

I thought so, but gave up on this. Methinks its just some lackey throwin' up the eBay ads, whether or not the actual seller knows their stuff or not.

[TAftonomos]

Scanning through a few more of his ads, I see the S4R motor I sold him.  Actually he bought the entire bike, broken frame, and all....for less than he wants for the motor.

I suppose that might be why he's got a MV Ago LOL....

edit...just got an email from him.  He was in a rush taking pics and it should be cleared up soon.  Has a set of jugs/piston from a 900 and from a 748.  He buys cheap and sells high, but if you can afford to hang onto the inventory until someone buys it, more power to ya!